About Product:: large industrial dual-purpose wrench is suitable for petroleum, chemical industry, metallurgy, power generation, oil refining, shipbuilding, petrochemical and other industries. It is a necessary tool for equipment installation, equipment and equipment maintenance and maintenance. Dual-purpose wrenches are divided into metric and English. Material of dual-purpose wrench: the dual-purpose wrench is made of 45th carbon steel or 40Cr alloy steel by integral forging. Manufacturing standard of dual-purpose wrench: GB/T4392-1995 (tapping wrench and slugging box spanner). Features of dual-purpose wrench: dual-purpose wrench is forged from high-quality carbon steel or high-quality alloy steel, with reasonable design, stable structure,